package com.wcx.mr.order;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

import java.io.IOException;

/**
 * 项目: hadoop-hdfs-client-demo
 * <p>
 * 功能描述:
 *
 * @author: WuChengXing
 * @create: 2020-11-22 16:43
 **/
public class OrderDriver {
    public static void main(String[] args) throws Exception, IOException {

// 输入输出路径需要根据自己电脑上实际的输入输出路径设置
        args  = new String[]{"E:\\test\\hadoop\\order\\input" , "E:\\test\\hadoop\\order\\output"};

        // 1 获取配置信息
        Configuration conf = new Configuration();
        Job job = Job.getInstance(conf);

        // 2 设置jar包加载路径
        job.setJarByClass(OrderDriver.class);

        // 3 加载map/reduce类
        job.setMapperClass(OrderMapper.class);
        job.setReducerClass(OrderReducer.class);

        // 4 设置map输出数据key和value类型
        job.setMapOutputKeyClass(OrderBean.class);
        job.setMapOutputValueClass(NullWritable.class);

        // 5 设置最终输出数据的key和value类型
        job.setOutputKeyClass(OrderBean.class);
        job.setOutputValueClass(NullWritable.class);

        // 6 设置输入数据和输出数据路径
        FileInputFormat.setInputPaths(job, new Path(args[0]));
        FileOutputFormat.setOutputPath(job, new Path(args[1]));

        // 8 设置reduce端的分组
        job.setGroupingComparatorClass(OrderGroupingComparator.class);

        // 7 提交
        boolean result = job.waitForCompletion(true);
        System.exit(result ? 0 : 1);
    }

}
